JPS5316329A - Chrome transformation coatings - Google Patents
Chrome transformation coatingsInfo
- Publication number
- JPS5316329A JPS5316329A JP6455577A JP6455577A JPS5316329A JP S5316329 A JPS5316329 A JP S5316329A JP 6455577 A JP6455577 A JP 6455577A JP 6455577 A JP6455577 A JP 6455577A JP S5316329 A JPS5316329 A JP S5316329A
- Authority
- JP
- Japan
- Prior art keywords
- coatings
- chromite
- electrolytes
- electrolyte
- criiiions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/38—Chromatising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
Abstract
A method of producing chromium conversion coatings is described. The coatings are novel in that they are chromite i.e. Cr2O3 coatings rather than the conventional chromate i.e. CrO3 coatings. The invention includes a novel electrolyte for depositing chromite layers. The electrolyte is an aqueous solution containing CrIIIions, a weak complexing agent for CrIIIions and a poison for the electrodeposition of chromium metal. The electrolyte preferably also contains conductivity salts and may include other additives such as fluoride ion and boric acid. Examples of poisons are CrVIions, peroxide, nitrate, polyamines, phosphates and formaldehyde. The chromite conversion coatings can be improved by aging and can be subsequently painted or lacquered. The electrolytes of the present invention are much less corrosive than CrVI electrolytes and thus the substrates which can be coated include materials which cannot readily be chromate coated because they are reactive towards CrVI electrolytes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB22686/76A GB1531056A (en) | 1976-06-01 | 1976-06-01 | Electrolytic production of chromium conversion coatings |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5316329A true JPS5316329A (en) | 1978-02-15 |
Family
ID=10183473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6455577A Pending JPS5316329A (en) | 1976-06-01 | 1977-05-31 | Chrome transformation coatings |
Country Status (6)
Country | Link |
---|---|
US (1) | US4137132A (en) |
JP (1) | JPS5316329A (en) |
DE (1) | DE2724730A1 (en) |
FR (1) | FR2353657A1 (en) |
GB (1) | GB1531056A (en) |
IT (1) | IT1078966B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5932481U (en) * | 1982-08-23 | 1984-02-29 | 株式会社岩崎 | Ink tank for writing instruments such as marking pens |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4569699A (en) * | 1985-05-08 | 1986-02-11 | The Dow Chemical Company | Method for providing a corrosion resistant coating for magnesium containing materials |
JPS62278298A (en) * | 1985-08-28 | 1987-12-03 | Kawasaki Steel Corp | Chromated zn or zn alloy plated steel sheet and its production |
JPS62107096A (en) * | 1985-11-01 | 1987-05-18 | Nippon Parkerizing Co Ltd | Surface treatment of galvanized steel sheet |
US4915799A (en) * | 1986-02-21 | 1990-04-10 | Kinki Yakuhin Industrial Co., Ltd. | Electrolytic coloring method for chromium alloy |
JPH0633465B2 (en) * | 1986-04-26 | 1994-05-02 | 日本パ−カライジング株式会社 | Post-treatment method for phosphate car body |
NL9000310A (en) * | 1989-02-27 | 1990-09-17 | Omi Int Corp | MIXTURE AND METHOD FOR CONVERSION. |
US6004448A (en) * | 1995-06-06 | 1999-12-21 | Atotech Usa, Inc. | Deposition of chromium oxides from a trivalent chromium solution containing a complexing agent for a buffer |
US9765437B2 (en) * | 2009-03-24 | 2017-09-19 | Roderick D. Herdman | Chromium alloy coating with enhanced resistance to corrosion in calcium chloride environments |
US9695523B2 (en) * | 2013-10-12 | 2017-07-04 | Hamilton Sundstrand Corporation | Controlled trivalent chromium pretreatment |
US10415148B2 (en) | 2014-03-07 | 2019-09-17 | Macdermid Acumen, Inc. | Passivation of micro-discontinuous chromium deposited from a trivalent electrolyte |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2733199A (en) * | 1956-01-31 | Electrolytic treatment of metal | ||
CA710309A (en) * | 1965-05-25 | Kitamura Yoichi | Coating metal surfaces with chromic oxide | |
US3032487A (en) * | 1958-05-30 | 1962-05-01 | Yawata Iron & Steel Co | Electrolytic treatment of ferrous metal surfaces |
NL129365C (en) * | 1962-11-10 | |||
GB1179021A (en) * | 1966-03-11 | 1970-01-28 | Kobe Steel Ltd | Electrolytic Surface Treatment of Metals |
FR1575654A (en) * | 1968-04-02 | 1969-07-25 |
-
1976
- 1976-06-01 GB GB22686/76A patent/GB1531056A/en not_active Expired
-
1977
- 1977-05-31 IT IT24216/77A patent/IT1078966B/en active
- 1977-05-31 US US05/802,193 patent/US4137132A/en not_active Expired - Lifetime
- 1977-05-31 JP JP6455577A patent/JPS5316329A/en active Pending
- 1977-06-01 DE DE19772724730 patent/DE2724730A1/en not_active Withdrawn
- 1977-06-01 FR FR7716685A patent/FR2353657A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5932481U (en) * | 1982-08-23 | 1984-02-29 | 株式会社岩崎 | Ink tank for writing instruments such as marking pens |
JPS62945Y2 (en) * | 1982-08-23 | 1987-01-10 |
Also Published As
Publication number | Publication date |
---|---|
FR2353657A1 (en) | 1977-12-30 |
US4137132A (en) | 1979-01-30 |
IT1078966B (en) | 1985-05-08 |
GB1531056A (en) | 1978-11-01 |
DE2724730A1 (en) | 1977-12-15 |
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